Welding is the most widely used material bonding process. In order to obtain the required weld quality, welding equipment, welding process, welding and all other parameters affecting the weld are described. One of the most important certifications is the welding process and the most influential certification of welders. This paper describes the certification of welding procedures by GTAW and certification of welder by SMAW. Both welding procedures, welding parameters, electrodes and additional materials, their advantages, disadvantages and errors are described in details. For certification of GTAW welding procedure, pWPS was made, and was welded by it, by certified welder. Subsequently, the weld was examined by destructive and non-destructive tests, the results of which were crucial for obtaining the certificate. All 6 tests was made, and the procedure passed for certificate. Certification of welders by SMAW was performed in such a way that the candidate for the welding certificate welded the sample by gotten WPS check his ability, skill and knowledge. The sample was tested for 2 non-destructive tests and welder did not get the certificate because of bad work techniques and fast welding speed, whose result is insufficient root penetration that is visible on the radiogram.